Covalent
organic
frameworks
(COFs)
are
a
class
of
porous
materials
with
exceptional
crystallinity,
porosity,
and
well-defined
structure,
which
crucial
for
detection
removal
applications.
In
this
study,
we
report
the
synthesis
emissive
stable
COFs
via
Schiff
base
condensation
reaction.
The
stability,
emission
properties
TT-COFs
attributed
to
intramolecular
hydrogen
bonding
between
OH
units
imine
bonds.
Through
π–π
stacking
interactions
adsorbed
bisphenol
molecules
COF
host,
demonstrate
sensitivity
selectivity
toward
A
(BPA)
in
water,
achieving
lower
limit
through
quenching
placing
them
among
best-reported
sensor
systems.
Additionally,
exhibit
rapid
adsorption
BPA
high
performance
(548
mg
g–1)
at
room
temperature,
along
efficient
sustained
cyclic
capability
without
significant
efficiency
loss.
This
research
represents
advancement
COF-based
approaches
substance
water
treatment.
Polymers,
Journal Year:
2024,
Volume and Issue:
16(18), P. 2578 - 2578
Published: Sept. 12, 2024
Covalent
organic
frameworks
(COFs)
have
garnered
significant
interest
within
the
scientific
community
due
to
their
distinctive
ability
act
as
semiconductors
responsive
visible
light.
This
unique
attribute
makes
them
up-and-coming
candidates
for
facilitating
photocatalytic
reactions.
Herein,
two
donor-acceptor
COFs,
TPE-BSD-COF
and
TPE-BD-COF,
been
designed
synthesized
by
incorporating
electron-rich
tetraphenylethylene
electron-deficient
benzoselenadiazole
benzothiadiazole
units
into
framework
through
a
Schiff-base
polycondensation
reaction.
Both
COFs
exhibit
exceptional
crystallinity
enduring
porosity.
TPE-BD-COF
broad
light
absorption
capabilities,
narrow
optical
band
gap,
low
electrochemical
impedance
spectrum
(EIS)
levels,
indicating
that
are
effective
heterogeneous
photocatalysts
reductive
dehalogenation
of
phenacyl
bromide
derivatives
under
blue
LED
irradiation.
A
high
yield
98%
95%
was
achieved
catalysts,
respectively,
only
one
hour.
Macromolecular Rapid Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 28, 2024
Abstract
2D
covalent
organic
frameworks
(COFs)
are
attractive
for
fluorescence
sensing
due
to
their
lightweight,
robust,
and
highly
ordered
porous
structures.
However,
the
conjugated
structures
between
adjacent
layers
of
can
often
result
in
aggregation‐caused
quenching
(ACQ)
properties.
Here,
study
designs
two
flexible
hydrazone‐linked
COFs
suppress
ACQ
effects,
thereby
enhancing
luminescent
activities.
Furthermore,
high
density
nitrogen
oxygen
atoms
on
these
walls
serves
as
binding
sites
hydrogen
bonding
interactions,
indicating
sensitivity
selectivity
towards
2,4,6‐trinitrophenol
detection.
Macromolecular Rapid Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 29, 2024
Abstract
Covalent
Organic
Frameworks
(COFs)
exhibit
a
range
of
exceptional
attributes,
including
notable
porosity,
outstanding
stability,
and
precisely
tuned
π‐conjugated
network,
rendering
them
highly
promising
candidates
for
fluorescence
sensors
applications.
In
this
study,
the
synthesis
two
emissive
hydrazone‐linked
COFs
designed
hydrazine
detection
is
presented.
The
partially
conjugated
structure
hydrazone
linkage
effectively
weakens
quenching
processes
induced
by
aggregation.
Additionally,
incorporation
flexible
structural
components
further
reduces
conjugation,
thereby
enhancing
luminescent
efficiency.
Remarkably,
these
possess
significant
abundance
heteroatoms,
enabling
distinctive
interactions
with
molecules,
which
in
turn
results
selectivity
sensitivity
detection.
limit
reaches
nanomolar
range,
surpassing
all
previously
reported
COFs,
underscoring
their
superior
performance
chemical
sensing
Polymer Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Two
emissive
hydrazone-linked
COFs
with
abundance
of
interaction
sites
were
synthesized,
showing
high
sensitivity
and
selectivity
for
hydrazine
sensing.
Covalent
organic
frameworks
(COFs)
are
a
class
of
porous
materials
with
exceptional
crystallinity,
porosity,
and
well-defined
structure,
which
crucial
for
detection
removal
applications.
In
this
study,
we
report
the
synthesis
emissive
stable
COFs
via
Schiff
base
condensation
reaction.
The
stability,
emission
properties
TT-COFs
attributed
to
intramolecular
hydrogen
bonding
between
OH
units
imine
bonds.
Through
π–π
stacking
interactions
adsorbed
bisphenol
molecules
COF
host,
demonstrate
sensitivity
selectivity
toward
A
(BPA)
in
water,
achieving
lower
limit
through
quenching
placing
them
among
best-reported
sensor
systems.
Additionally,
exhibit
rapid
adsorption
BPA
high
performance
(548
mg
g–1)
at
room
temperature,
along
efficient
sustained
cyclic
capability
without
significant
efficiency
loss.
This
research
represents
advancement
COF-based
approaches
substance
water
treatment.
